From: Joe Crawford (abjcrawford@yahoo.com)
Date: Thu Feb 02 2006 - 14:30:20 EST
Assumption
When a HP-UX system is booted, the HP-UX bootstrap
process, hpux, verifies that the root volume group
meets quorum. Quorum is met when more than 50% of the
disks that make up that volume group are accessible.
This was often not an issue on older systems where
small disks were in use, but now that disks with large
amounts of storage are available, the root volume
group is often made up of just two disks. Thus,
neither disk can be lost or the server won’t reboot
without intervention. It can be argued that losing
one of two disks is a big issue and the server should
not be rebooted. However, with very short recovery
objectives in place, having the server come back up
and be available, even if degraded, is required. The
bootstrap process does give us the ability to
over-ride this default behavior and not require quorum
to be met by using the “-lq” parameter with the hpux
command in the AUTO file (found in the LIF area on a
bootable disk).
We have scripted a low risk solution to be deployed
via Tivoli, where possible, and manually to all other
nodes. The same script will be applied to all servers
(automatically or manually). Please note that the
only change being made is to add “-lq” to the hpux
command in the AUTO file on the primary and alternate
boot devices. If the hpux bootstrap command isn’t
found in the AUTO file, the AUTO file isn’t found, the
devices aren’t disks, etc - no updates are made.
- The script will:
Determine the primary and alternate boot paths from
setboot
Determine the character device files associated with
the primary and alternate HW addresses
For each device,
If the device is a disk
Determine if “-lq” is already part of the AUTO file
configuration
If “-lq” is missing from the AUTO file, then add it
Record before and after settings
Display results
We are planning to deploy this on some 80+ HP-UX
servers. Please Advise me if there is any glich in
this approach.
Thanks
Joe
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